PreenFM > preenfm2 and preenfm3



My display remains black when i turn on the preenfm2

Check that you removed the jumper JMP3, and turn it off and on again.

The encoders does not respond correctly

If you need 2 ticks to increase by one the value or if one tick increases by 2 the values, you need to change the encoder drivers.
In the menu (Menu > tools > set > "Rot. enc.") you can chose between 2 encoder drivers: 12 and 24.

Where are the last firmwares or other files to download

Here :

Should i use the overclocked firmware ?

I've never seen any problem with it, and you'll get a better sound specially when playing high notes. Sampling rate is 42000 instead of 38000Hz.
I don't feel comfortable flashing it by default because the STM32F4 is not supposed to run at 192Mhz.

My PreenFM does not boot (display full of square)

If it's stuck with the display full of square, the PreenFM2 cannot read your Usb Stick.
Be sure "/pfm2/" directory exists.
Try to reformat your USB stick and reinstall /pfm2/ on it (yes it was sufficient to several people).
If still no success, try an other stick. <=4Gb are more likely to work.

How do i enter the bootloader

Pressing a key when switching on the PreenFM.

The Midi over USB does not work / The Led is not flashing on midi clock beat

Must be enable in the settings.

Can i access USB drive without opening my PreenFM2

Yes you need bootloader 1.10+
The PreenFM2 registers to your computer as a mass storage and redirect all low level access to the USB stick.
Don't expect high bandwidth, but it works :-)

What are P1, P2 and P3 for ?

. P1 allows you to plug a st-link v2 debugger.
. P2 extension port  (removed from PCB R5)
. P3 analog input. CV you need the adcIn branch of the github repository :

Except P1, none of them is useful today, and i cannot guarantee they will be useful someday.

TroubleShooting / It does not work

You can start by reading this thread :
And verify the different points shown of message #6.


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